US20090294994A1 - Bond pad structure - Google Patents
Bond pad structureDownload PDFInfo
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- US20090294994A1 US20090294994A1US12/129,333US12933308AUS2009294994A1US 20090294994 A1US20090294994 A1US 20090294994A1US 12933308 AUS12933308 AUS 12933308AUS 2009294994 A1US2009294994 A1US 2009294994A1
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- pad structure
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- H01L24/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L24/02—Bonding areas ; Manufacturing methods related thereto
- H01L24/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L24/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
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- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/0212—Auxiliary members for bonding areas, e.g. spacers
- H01L2224/02122—Auxiliary members for bonding areas, e.g. spacers being formed on the semiconductor or solid-state body
- H01L2224/02163—Auxiliary members for bonding areas, e.g. spacers being formed on the semiconductor or solid-state body on the bonding area
- H01L2224/02165—Reinforcing structures
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- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/023—Redistribution layers [RDL] for bonding areas
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- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
- H01L2224/05001—Internal layers
- H01L2224/05075—Plural internal layers
- H01L2224/0508—Plural internal layers being stacked
- H01L2224/05085—Plural internal layers being stacked with additional elements, e.g. vias arrays, interposed between the stacked layers
- H01L2224/05089—Disposition of the additional element
- H01L2224/05093—Disposition of the additional element of a plurality of vias
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- H01L2224/02—Bonding areas; Manufacturing methods related thereto
- H01L2224/04—Structure, shape, material or disposition of the bonding areas prior to the connecting process
- H01L2224/05—Structure, shape, material or disposition of the bonding areas prior to the connecting process of an individual bonding area
- H01L2224/05001—Internal layers
- H01L2224/05075—Plural internal layers
- H01L2224/0508—Plural internal layers being stacked
- H01L2224/05085—Plural internal layers being stacked with additional elements, e.g. vias arrays, interposed between the stacked layers
- H01L2224/05089—Disposition of the additional element
- H01L2224/05093—Disposition of the additional element of a plurality of vias
- H01L2224/05095—Disposition of the additional element of a plurality of vias at the periphery of the internal layers
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- H01L2224/05599—Material
- H01L2224/056—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof
- H01L2224/05617—Material with a principal constituent of the material being a metal or a metalloid, e.g. boron [B], silicon [Si], germanium [Ge], arsenic [As], antimony [Sb], tellurium [Te] and polonium [Po], and alloys thereof the principal constituent melting at a temperature of greater than or equal to 400°C and less than 950°C
- H01L2224/05624—Aluminium [Al] as principal constituent
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- H01L23/52—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames
- H01L23/522—Arrangements for conducting electric current within the device in operation from one component to another, i.e. interconnections, e.g. wires, lead frames including external interconnections consisting of a multilayer structure of conductive and insulating layers inseparably formed on the semiconductor body
- H01L23/5226—Via connections in a multilevel interconnection structure
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- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/14—Integrated circuits
Definitions
- the present inventiongenerally relates to a bond pad structure, and more particularly, to a bond pad structure located over an active circuit structure.
- an integrated circuitAlong with the higher and higher integrity of an integrated circuit (IC), the area of an IC chip is a very significant factor affecting the cost thereof. The larger the area of a chip, the higher the IC cost is.
- an I/O circuit, an electrostatic discharge protection circuit and a bond padIn association with an IC, an I/O circuit, an electrostatic discharge protection circuit and a bond pad also occupy certain areas. These areas may be even larger than the area of the active circuit structure itself in some circumstances.
- a bond padis located on the periphery region of the above-mentioned I/O circuit.
- a techniquehas been developed, where a bond pad, an I/O circuit and an active circuit structure are formed on a same region by using a process technology, and such a technique is termed as BOAC technique (bond pad over active circuit).
- the bond padmay be fractured or peeled from a dielectric layer due to the impacts caused by a wiring press or a wiring pull, which further results in poor conductance of the product.
- a metal layer for supportingis formed under the bond pad.
- the bond pad structureemploys only one metal layer for supporting. In fact, with the bond pad structure having a metal layer for supporting, the bond pad structure still has risk of being fractured or peeled from a dielectric layer and even damaging other semiconductor structures under the bond pad during a wiring process.
- the present inventionis directed to a bond pad structure, which may reduce the possibility of being fractured or peeled from a dielectric layer.
- the present inventionis also directed to a bond pad structure capable of effectively protecting the semiconductor structure under the bond pad.
- the present inventionprovides a bond pad structure located over an active circuit structure.
- the bond pad structureincludes a bond pad, a passivation layer and a topmost metal layer in the active circuit structure.
- the passivation layercovers the bond pad and has an opening, and the opening exposes a portion of the bond pad.
- the part of the topmost metal layer under the openingserves as a supporting layer.
- the supporting layerhas at least a slot.
- the topmost metal layeris electrically connected to the bond pad through a plurality of via plugs.
- the pattern of the supporting layeris at least two bar patterns, for example.
- the bar patternsare arranged, for example, parallel to each other.
- the bar patternsare connected to each other, for example.
- the pattern of the supporting layeris a spiral pattern, for example.
- the pattern of the supporting layeris, for example, a grillwork pattern.
- the pattern of the supporting layeris at least two ring patterns, for example.
- the ring patternsare concentric ring patterns, for example.
- the present inventionfurther provides another bond pad structure located over an active circuit structure.
- the bond pad structureincludes a bond pad, a passivation layer, a topmost metal layer in the active circuit structure and a plurality of via plugs.
- the bond padincludes a bonding portion and a non-bonding portion, wherein at least a portion of the bonding portion is a bonding region.
- the passivation layercovers the bond pad and has an opening, and the opening exposes the bonding portion of the bond pad.
- the topmost metal layerincludes a supporting layer and a circuit layer.
- the supporting layeris located under the bonding region of the bond pad and has at least a slot.
- the circuit layeris located under the non-bonding portion of the bond pad, and the circuit layer and the supporting layer are connected to each other.
- the bond padis electrically connected to the circuit layer through the via plugs.
- the pattern of the supporting layeris at least two bar patterns, for example.
- the bar patternsare arranged, for example, parallel to each other.
- the bar patternsare connected to each other, for example.
- the pattern of the supporting layeris a spiral pattern, for example.
- the pattern of the supporting layeris, for example, a grillwork pattern.
- the pattern of the supporting layeris at least two ring patterns, for example.
- the ring patternsare concentric ring patterns, for example.
- the supporting layer and the circuit layerare connected to each other.
- the supporting layer and the circuit layerare not connected to each other.
- the non-bonding portionis located at a side of the bonding portion.
- the non-bonding portionis located at both sides of the bonding portion.
- each of the bar patterns and the circuit layer located at at least one side of the bar patternsare connected to each other, for example.
- an extending direction of the bar patterns and an extending direction of the bonding portionare parallel or perpendicular, for example.
- the via plugs located at both sides of the bonding portionare symmetrical about the bonding portion.
- the via plugs located at both sides of the bonding portionare unsymmetrical about the bonding portion.
- the supporting layer in the bond pad structure provided by the present inventionhas at least a slot, the Young's modulus of the supporting layer is increased, which further enhances the wire pull strength of the bond pad and promotes the reliability thereof and avoids the bond pad from being fractured or peeled from the dielectric layer during a wiring process.
- the employed supporting layeralso functions to prevent a possible harm on the semiconductor structure under the bond pad due to a wiring pressure.
- FIG. 1is a schematic top view of a bond pad structure and a topmost metal layer according to the first embodiment of the present invention.
- FIG. 2is a cross-sectional diagram along the line I-I in FIG. 1 .
- FIG. 3is a schematic top view of a bond pad structure and a topmost metal layer according to the second embodiment of the present invention.
- FIG. 4is a schematic top view of a bond pad structure and a topmost metal layer according to the third embodiment of the present invention.
- FIG. 5is a schematic top view of a bond pad structure and a topmost metal layer according to the fourth embodiment of the present invention.
- FIG. 6is a schematic top view of a bond pad structure and a topmost metal layer according to the fifth embodiment of the present invention.
- FIG. 7is a schematic top view of a bond pad structure and a topmost metal layer according to the sixth embodiment of the present invention.
- FIG. 8is a schematic top view of a bond pad structure and a topmost metal layer according to the seventh embodiment of the present invention.
- FIG. 9is a cross-sectional diagram of a bond pad structure and a topmost metal layer according to the eighth embodiment of the present invention.
- FIG. 1is a schematic top view of a bond pad structure and a topmost metal layer according to the first embodiment of the present invention.
- FIG. 2is a cross-sectional diagram along the line I-I in FIG. 1 .
- a bond pad structure 100is located over an active circuit structure 104 on a substrate 102 .
- the bond pad structure 100includes a bond pad 106 , a passivation layer 108 , a topmost metal layer 110 in the active circuit structure 104 and via plugs 112 .
- other metal layers in the active circuit structure 104serve for customized routing.
- the bond pad 106includes a bonding portion 114 and a non-bonding portion 116 , wherein the bonding portion 114 is the portion to conduct wiring, and the non-bonding portion 116 is the portion without conducting wiring.
- the non-bonding portion 116is located, for example, at one side of the bonding portion 114 .
- the material of the bond pad 106is, for example, a metal material such as aluminium.
- the location of the non-bonding portion 116 at one side of the bonding portion 114is exemplarily defined, but it does not limit the scope of the present invention. In other embodiments, the non-bonding portion 116 can be located at both sides of the bonding portion 114 .
- the passivation layer 108covers the bond pad 106 so as to avoid the bond pad 106 from contacting exterior to cause contamination, metal oxidation or damage.
- the passivation layer 108has an opening 118 to expose the bonding portion 114 of the bond pad 106 .
- the material of the passivation layer 108comprises, for example, silicon oxide, silicon nitride or other dielectric materials.
- the topmost metal layer 110includes a supporting layer 120 and a circuit layer 122 .
- the material of the topmost metal layer 110comprises, for example, a metal material such as copper.
- the supporting layer 120is located under the bonding portion 114 of the bond pad 106 , wherein the bonding portion 114 is exposed by the opening 118 .
- the circuit layer 122is located under the non-bonding portion 116 of the bond pad 106 .
- the supporting layer 120 and the circuit layer 122are, for example, connected to each other. In the other embodiments, the supporting layer 120 and the circuit layer 122 can be not connected to each other too.
- the supporting layer 120has at least a slot 124 , which functions to increase the Young's modulus of the supporting layer 120 .
- the pattern of the supporting layer 120is at least two bar patterns 126 (for example, six bar patterns 126 in FIG. 1 ), for example, the bar patterns 126 are, for example, parallel to each other.
- the connection type of the circuit layer 122 and the supporting layer 120is that each of the bar patterns 126 is connected to circuit layer 122 respectively, but it is to be understood that the connection type of the circuit layer 122 and the supporting layer 120 is not intended to limit the scope of this invention.
- the bond pad 106is electrically connected to the circuit layer 122 through the via plugs 112 .
- the material of the via plugs 112comprises, for example, a metal such as tungsten.
- the supporting layer 120 in the bond pad structure 100has at least a slot 124 , the Young's modulus of the supporting layer 120 is accordingly increased, which further enhances the wire pull strength and promotes the reliability. In this way, the possibility of fracturing of the bond pad 106 or the peeling problem of the bond pad 106 from the dielectric layer during a successive wiring process may be effectively reduced.
- the supporting layer 120can also protect the semiconductor structure under the bond pad 106 ; moreover, a possible harm on the semiconductor structure (for example, other metal layers in the active circuit structure 104 ) caused by a wiring pressure can be prevented.
- FIG. 3is a schematic top view of a bond pad structure and a topmost metal layer according to the second embodiment of the present invention. Note that all the same parts in FIG. 3 as that in FIG. 1 are marked with the same notations and omitted to describe for simplicity.
- the bond pad structure 200 of the second embodimentis different from the bond pad structure 100 of the first embodiment that both the non-bonding portion 116 of the bond pad 106 and the via plugs 112 in the first embodiment are located at one side of the bonding portion 114 , but the non-bonding portion 216 of the bond pad 206 and the via plugs 212 are respectively located at both sides of the bonding portion 214 .
- the circuit layer 222is located at both sides of the supporting layer 220 .
- the supporting layer 220 and the circuit layer 222are, for example, connected to each other. In the other embodiments, the supporting layer 220 and the circuit layer 222 can be not connected to each other too.
- the via plugs 212 located at both sides of the bonding portion 214are symmetrical about the bonding portion 214 . In other embodiments, the via plugs 212 located at both sides of the bonding portion 214 can be unsymmetrical about the bonding portion 214 .
- the parts of the bond pad structure 200 of the second embodiment and the similar parts of the bond pad structure 100 of the first embodimenthave almost the same materials and functions, which are omitted to describe herein for simplicity.
- the bond pad structure 200 of the second embodiment and the bond pad structure 100 of the first embodimenthave the similar technical features; that is, the supporting layer 220 has at least a slot 224 located between the two bar patterns 226 of the supporting layer 220 , therefore, the fracture of the bond pad 206 or the peeling problem of the bond pad 206 from the dielectric layer during a successive wiring process can be avoided, and moreover, the semiconductor structure under the bond pad 206 can be effectively protected as well.
- FIG. 4is a schematic top view of a bond pad structure and a topmost metal layer according to the third embodiment of the present invention. Note that all the same parts in FIG. 4 as that in FIG. 1 are marked with the same notations and omitted to describe for simplicity.
- each of the bar patterns 126is not connected to each other and connected to the circuit layer 122 respectively. But, in the supporting layer 320 of the topmost metal layer 310 of the third embodiment, each of the bar patterns 326 is connected to each other, and one of the bar patterns 326 and the circuit layer 322 are connected to each other. In the other embodiments, the supporting layer 320 and the circuit layer 322 can be not connected to each other too.
- An extending direction of the bar patterns 326 and an extending direction of the bonding portion 114are parallel, for example.
- the extending direction of the bar patterns 326 and the extending direction of the bonding portion 114could be perpendicular.
- the parts of the bond pad structure 300 of the third embodiment and the similar parts of the bond pad structure 100 of the first embodimenthave almost the same materials and functions, which are omitted to describe herein for simplicity.
- the bond pad structure 300 of the third embodiment and the bond pad structure 100 of the first embodimenthave similar technical features; that is, the supporting layer 320 has at least a slot 324 within the pattern thereof, therefore, the fracture of the bond pad 106 or the peeling problem of the bond pad 106 from the dielectric layer during a successive wiring process can be avoided, and moreover, the semiconductor structure under the bond pad 106 can be effectively protected as well.
- FIG. 5is a schematic top view of a bond pad structure and a topmost metal layer according to the fourth embodiment of the present invention. Note that all the same parts in FIG. 5 as that in FIG. 1 are marked with the same notations and omitted to describe for simplicity.
- the bond pad structure 400 of the fourth embodimentis different from the bond pad structure 100 of the first embodiment that the pattern of the supporting layer 120 of the topmost metal layer 110 in the first embodiment is at least two bar patterns 126 (for example, six parallel bar patterns 126 in FIG. 1 ); but the pattern of the supporting layer 420 of the topmost metal layer 410 of the forth embodiment is a spiral pattern 426 .
- the supporting layer 420 of the topmost metal layer 410is, for example, electrically connected to the circuit layer 422 . In the other embodiments, the supporting layer 420 and the circuit layer 422 can be not connected to each other too.
- the parts of-the bond pad structure 400 in the fourth embodiment and the similar parts of the bond pad structure 100 in the first embodimenthave almost the same materials and functions, which are omitted to describe herein for simplicity.
- the bond pad structure 400 of the fourth embodiment and the bond pad structure 100 of the first embodimenthave the similar technical features; that is, the supporting layer 420 has at least a slot 424 within the supporting layer 420 , therefore, the fracture of the bond pad 106 or the peeling problem of the bond pad 106 from the dielectric layer during a successive wiring process can be avoided, and moreover, the semiconductor structure under the bond pad 106 can be effectively protected as well.
- FIG. 6is a schematic top view of a bond pad structure and a topmost metal layer according to the fifth embodiment of the present invention. Note that all the same parts in FIG. 6 as that in FIG. 1 are marked with the same notations and omitted to describe for simplicity.
- the bond pad structure 500 of the fifth embodimentis different from the bond pad structure 100 of the first embodiment that the pattern of the supporting layer 120 of the topmost metal layer 110 in the first embodiment is at least two bar patterns 126 (for example, six parallel bar patterns 126 in FIG. 1 ); but the pattern of the supporting layer 520 of the topmost metal layer 510 in the fifth embodiment is a grillwork pattern.
- the supporting layer 520 of the topmost metal layer 510is, for example, electrically connected to the circuit layer 522 . In the other embodiments, the supporting layer 520 and the circuit layer 522 can be not connected to each other too.
- the parts of the bond pad structure 500 of the fifth embodiment and the similar parts of the bond pad structure 100 of the first embodimenthave almost the same materials and functions, which are omitted to describe herein for simplicity.
- the bond pad structure 500 of the fifth embodiment and the bond pad structure 100 of the first embodimenthave the similar technical features; that is, the supporting layer 520 has at least a slot 524 within the grillwork pattern of the supporting layer 520 , therefore, the fracture of the bond pad 106 or the peeling problem of the bond pad 106 from the dielectric layer during a successive wiring process can be avoided, and moreover, the semiconductor structure under the bond pad 106 can be effectively protected as well.
- FIG. 7is a schematic top view of a bond pad structure and a topmost metal layer according to the sixth embodiment of the present invention. Note that all the same parts in FIG. 7 as that in FIG. 3 are marked with the same notations and omitted to describe for simplicity.
- the bond pad structure 600 of the sixth embodimentis different from the bond pad structure 200 of the second embodiment that each of the bar patterns 226 and the circuit layer 222 located at both sides of the bar patterns 226 are connected to each other in the supporting layer 220 of the topmost metal layer 210 of the second embodiment; but each of the bar patterns 626 and the circuit layer 622 located at at least one side of the bar patterns 626 are connected to each other in the supporting layer 620 of the topmost metal layer 610 of the sixth embodiment. In the other embodiments, the supporting layer 620 and the circuit layer 622 can be not connected to each other too. Besides, the parts of the bond pad structure 600 of the sixth embodiment and the similar parts of the bond pad structure 200 of the second embodiment have almost the same materials and functions, which are omitted to describe herein for simplicity.
- the bond pad structure 600 of the sixth embodiment and the bond pad structure 200 of the second embodimenthave the similar technical features; that is, the supporting layer 620 has at least a slot 624 within the supporting layer 620 , therefore, the fracture of the bond pad 206 or the peeling problem of the bond pad 206 from the dielectric layer during a successive wiring process can be avoided, and moreover, the semiconductor structure under the bond pad 206 can be effectively protected as well.
- FIG. 8is a schematic top view of a bond pad structure and a topmost metal layer according to the seventh embodiment of the present invention. Note that all the same parts in FIG. 8 as that in FIG. 1 are marked with the same notations and omitted to describe for simplicity.
- the bond pad structure 700 of the seventh embodimentis different from the bond pad structure 100 of the first embodiment that the pattern of the supporting layer 120 of the topmost metal layer 110 in the first embodiment is at least two bar patterns 126 (for example, six parallel bar patterns 126 in FIG. 1 ); but the pattern of the supporting layer 720 of the topmost metal layer 710 of the seventh embodiment is at least two ring patterns 726 (for example, three ring patterns 726 in FIG. 5 ), and the ring patterns 726 are concentric ring patterns, for example.
- the supporting layer 720 of the topmost metal layer 710is, for example, not electrically connected to the circuit layer 722 .
- the supporting layer 720 and the circuit layer 722can be connected to each other too.
- the parts of the bond pad structure 700 in the seventh embodiment and the similar parts of the bond pad structure 100 in the first embodimenthave almost the same materials and functions, which are omitted to describe herein for simplicity.
- the bond pad structure 700 of the seventh embodiment and the bond pad structure 100 of the first embodimenthave the similar technical features; that is, the supporting layer 720 has at least a slot 724 within the supporting layer 720 , therefore, the fracture of the bond pad 106 or the peeling problem of the bond pad 106 from the dielectric layer during a successive wiring process can be avoided, and moreover, the semiconductor structure under the bond pad 106 can be effectively protected as well.
- the supporting layersare located under the whole bonding portion, for example.
- the bonding portionat least a portion of the bonding portion is a region for wiring, and the region is named a bonding region. Therefore, as long as the supporting layer is located under the bonding region, the effectiveness of the invention could be achieved. Thereinafter, an embodiment is provided to illustrate.
- FIG. 9is a cross-sectional diagram of a bond pad structure and a topmost metal layer according to the eighth embodiment of the present invention. Note that all the same parts in FIG. 9 as that in FIG. 2 are marked with the same notations and omitted to describe for simplicity.
- the bond pad structure 800 of the eighth embodimentis different from the bond pad structure 100 of the first embodiment that the supporting layer 120 is located under the whole bonding portion 114 in the first embodiment; but the bonding portion 114 of the eighth embodiment is divided into a bonding region 802 and a non-bonding region 804 , and the supporting layer 820 is only located under the bonding region 802 used for wiring.
- the pattern of the supporting layer 820is anyone of the patterns of the supporting layers in the first to seventh embodiments.
- the parts of the bond pad structure 800 in the eighth embodiment and the similar parts of the bond pad structure 100 in the first embodimenthave almost the same materials and functions, which are omitted to describe herein for simplicity.
- the supporting layer 820is only located under the bonding region 802 , the space under the non-bonding region 804 could be used to fabricate the customized routing 806 .
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Abstract
Description
- 1. Field of the Invention
- The present invention generally relates to a bond pad structure, and more particularly, to a bond pad structure located over an active circuit structure.
- 2. Description of Related Art
- Along with the higher and higher integrity of an integrated circuit (IC), the area of an IC chip is a very significant factor affecting the cost thereof. The larger the area of a chip, the higher the IC cost is. In association with an IC, an I/O circuit, an electrostatic discharge protection circuit and a bond pad also occupy certain areas. These areas may be even larger than the area of the active circuit structure itself in some circumstances.
- In general, a bond pad is located on the periphery region of the above-mentioned I/O circuit. In order to largely reduce the chip area and the production cost, in the prior art, a technique has been developed, where a bond pad, an I/O circuit and an active circuit structure are formed on a same region by using a process technology, and such a technique is termed as BOAC technique (bond pad over active circuit).
- During a wiring process on a bond pad, the bond pad may be fractured or peeled from a dielectric layer due to the impacts caused by a wiring press or a wiring pull, which further results in poor conductance of the product. To solve this problem of the prior art, a metal layer for supporting is formed under the bond pad. Although a bond pad structure employs more metal layers for supporting, the strength of the bond pad structure can be enhanced, but it brings new problems of wasting space and increasing cost.
- To promote the efficiency of a semiconductor device in the currently conventional semiconductor process, a material with a lower dielectric coefficient is preferably used for forming the dielectric layer. However, the dielectric layer with the lower dielectric coefficient has a weak strength, which would lower the wire pull strength of the bond pad structure and degrade the reliability. As a compromise solution, the bond pad structure employs only one metal layer for supporting. In fact, with the bond pad structure having a metal layer for supporting, the bond pad structure still has risk of being fractured or peeled from a dielectric layer and even damaging other semiconductor structures under the bond pad during a wiring process.
- Accordingly, the present invention is directed to a bond pad structure, which may reduce the possibility of being fractured or peeled from a dielectric layer.
- The present invention is also directed to a bond pad structure capable of effectively protecting the semiconductor structure under the bond pad.
- The present invention provides a bond pad structure located over an active circuit structure. The bond pad structure includes a bond pad, a passivation layer and a topmost metal layer in the active circuit structure. The passivation layer covers the bond pad and has an opening, and the opening exposes a portion of the bond pad. The part of the topmost metal layer under the opening serves as a supporting layer. The supporting layer has at least a slot. The topmost metal layer is electrically connected to the bond pad through a plurality of via plugs.
- According to an embodiment of the present invention, in the above-mentioned bond pad structure, the pattern of the supporting layer is at least two bar patterns, for example.
- According to an embodiment of the present invention, in the above-mentioned bond pad structure, the bar patterns are arranged, for example, parallel to each other.
- According to an embodiment of the present invention, in the above-mentioned bond pad structure, the bar patterns are connected to each other, for example.
- According to an embodiment of the present invention, in the above-mentioned bond pad structure, the pattern of the supporting layer is a spiral pattern, for example.
- According to an embodiment of the present invention, in the above-mentioned bond pad structure, the pattern of the supporting layer is, for example, a grillwork pattern.
- According to an embodiment of the present invention, in the above-mentioned bond pad structure, the pattern of the supporting layer is at least two ring patterns, for example.
- According to an embodiment of the present invention, in the above-mentioned bond pad structure, the ring patterns are concentric ring patterns, for example.
- The present invention further provides another bond pad structure located over an active circuit structure. The bond pad structure includes a bond pad, a passivation layer, a topmost metal layer in the active circuit structure and a plurality of via plugs. The bond pad includes a bonding portion and a non-bonding portion, wherein at least a portion of the bonding portion is a bonding region. The passivation layer covers the bond pad and has an opening, and the opening exposes the bonding portion of the bond pad. The topmost metal layer includes a supporting layer and a circuit layer. The supporting layer is located under the bonding region of the bond pad and has at least a slot. The circuit layer is located under the non-bonding portion of the bond pad, and the circuit layer and the supporting layer are connected to each other. The bond pad is electrically connected to the circuit layer through the via plugs.
- According to another embodiment of the present invention, in the above-mentioned bond pad structure, the pattern of the supporting layer is at least two bar patterns, for example.
- According to another embodiment of the present invention, in the above-mentioned bond pad structure, the bar patterns are arranged, for example, parallel to each other.
- According to another embodiment of the present invention, in the above-mentioned bond pad structure, the bar patterns are connected to each other, for example.
- According to another embodiment of the present invention, in the above-mentioned bond pad structure, the pattern of the supporting layer is a spiral pattern, for example.
- According to another embodiment of the present invention, in the above-mentioned bond pad structure, the pattern of the supporting layer is, for example, a grillwork pattern.
- According to another embodiment of the present invention, in the above-mentioned bond pad structure, the pattern of the supporting layer is at least two ring patterns, for example.
- According to another embodiment of the present invention, in the above-mentioned bond pad structure, the ring patterns are concentric ring patterns, for example.
- According to another embodiment of the present invention, in the above-mentioned bond pad structure, the supporting layer and the circuit layer are connected to each other.
- According to another embodiment of the present invention, in the above-mentioned bond pad structure, the supporting layer and the circuit layer are not connected to each other.
- According to another embodiment of the present invention, in the above-mentioned bond pad structure, the non-bonding portion is located at a side of the bonding portion.
- According to another embodiment of the present invention, in the above-mentioned bond pad structure, the non-bonding portion is located at both sides of the bonding portion.
- According to another embodiment of the present invention, in the above-mentioned bond pad structure, each of the bar patterns and the circuit layer located at at least one side of the bar patterns are connected to each other, for example.
- According to another embodiment of the present invention, in the above-mentioned bond pad structure, an extending direction of the bar patterns and an extending direction of the bonding portion are parallel or perpendicular, for example.
- According to another embodiment of the present invention, in the above-mentioned bond pad structure, the via plugs located at both sides of the bonding portion are symmetrical about the bonding portion.
- According to another embodiment of the present invention, in the above-mentioned bond pad structure, the via plugs located at both sides of the bonding portion are unsymmetrical about the bonding portion.
- Based on the above described, since the supporting layer in the bond pad structure provided by the present invention has at least a slot, the Young's modulus of the supporting layer is increased, which further enhances the wire pull strength of the bond pad and promotes the reliability thereof and avoids the bond pad from being fractured or peeled from the dielectric layer during a wiring process. In addition, the employed supporting layer also functions to prevent a possible harm on the semiconductor structure under the bond pad due to a wiring pressure.
- The accompanying drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. The drawings illustrate embodiments of the invention and, together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic top view of a bond pad structure and a topmost metal layer according to the first embodiment of the present invention.FIG. 2 is a cross-sectional diagram along the line I-I inFIG. 1 .FIG. 3 is a schematic top view of a bond pad structure and a topmost metal layer according to the second embodiment of the present invention.FIG. 4 is a schematic top view of a bond pad structure and a topmost metal layer according to the third embodiment of the present invention.FIG. 5 is a schematic top view of a bond pad structure and a topmost metal layer according to the fourth embodiment of the present invention.FIG. 6 is a schematic top view of a bond pad structure and a topmost metal layer according to the fifth embodiment of the present invention.FIG. 7 is a schematic top view of a bond pad structure and a topmost metal layer according to the sixth embodiment of the present invention.FIG. 8 is a schematic top view of a bond pad structure and a topmost metal layer according to the seventh embodiment of the present invention.FIG. 9 is a cross-sectional diagram of a bond pad structure and a topmost metal layer according to the eighth embodiment of the present invention.- Reference will now be made in detail to the present preferred embodiments of the invention, examples of which are illustrated in the accompanying drawings. Wherever possible, the same reference numbers are used in the drawings and the description to refer to the same or like parts.
FIG. 1 is a schematic top view of a bond pad structure and a topmost metal layer according to the first embodiment of the present invention.FIG. 2 is a cross-sectional diagram along the line I-I inFIG. 1 .- Referring to
FIGS. 1 and 2 , abond pad structure 100 is located over anactive circuit structure 104 on a substrate102. Thebond pad structure 100 includes abond pad 106, apassivation layer 108, atopmost metal layer 110 in theactive circuit structure 104 and viaplugs 112. In addition, other metal layers in theactive circuit structure 104 serve for customized routing. - The
bond pad 106 includes abonding portion 114 and anon-bonding portion 116, wherein thebonding portion 114 is the portion to conduct wiring, and thenon-bonding portion 116 is the portion without conducting wiring. Thenon-bonding portion 116 is located, for example, at one side of thebonding portion 114. The material of thebond pad 106 is, for example, a metal material such as aluminium. - In the first embodiment, the location of the
non-bonding portion 116 at one side of thebonding portion 114 is exemplarily defined, but it does not limit the scope of the present invention. In other embodiments, thenon-bonding portion 116 can be located at both sides of thebonding portion 114. - The
passivation layer 108 covers thebond pad 106 so as to avoid thebond pad 106 from contacting exterior to cause contamination, metal oxidation or damage. Thepassivation layer 108 has anopening 118 to expose thebonding portion 114 of thebond pad 106. The material of thepassivation layer 108 comprises, for example, silicon oxide, silicon nitride or other dielectric materials. - The
topmost metal layer 110 includes a supportinglayer 120 and acircuit layer 122. The material of thetopmost metal layer 110 comprises, for example, a metal material such as copper. The supportinglayer 120 is located under thebonding portion 114 of thebond pad 106, wherein thebonding portion 114 is exposed by theopening 118. Thecircuit layer 122 is located under thenon-bonding portion 116 of thebond pad 106. The supportinglayer 120 and thecircuit layer 122 are, for example, connected to each other. In the other embodiments, the supportinglayer 120 and thecircuit layer 122 can be not connected to each other too. - The supporting
layer 120 has at least aslot 124, which functions to increase the Young's modulus of the supportinglayer 120. There is no limitation on the pattern of the supportinglayer 120, but the pattern of the supportinglayer 120 must contain aslot 124. In the first embodiment, the pattern of the supportinglayer 120 is at least two bar patterns126 (for example, sixbar patterns 126 inFIG. 1 ), for example, thebar patterns 126 are, for example, parallel to each other. In the embodiment, although the connection type of thecircuit layer 122 and the supportinglayer 120 is that each of thebar patterns 126 is connected tocircuit layer 122 respectively, but it is to be understood that the connection type of thecircuit layer 122 and the supportinglayer 120 is not intended to limit the scope of this invention. - The
bond pad 106 is electrically connected to thecircuit layer 122 through the via plugs112. The material of the via plugs112 comprises, for example, a metal such as tungsten. - It can be seen from the above-described first embodiment, since the supporting
layer 120 in thebond pad structure 100 has at least aslot 124, the Young's modulus of the supportinglayer 120 is accordingly increased, which further enhances the wire pull strength and promotes the reliability. In this way, the possibility of fracturing of thebond pad 106 or the peeling problem of thebond pad 106 from the dielectric layer during a successive wiring process may be effectively reduced. In addition, during the successive wiring process, the supportinglayer 120 can also protect the semiconductor structure under thebond pad 106; moreover, a possible harm on the semiconductor structure (for example, other metal layers in the active circuit structure104) caused by a wiring pressure can be prevented. FIG. 3 is a schematic top view of a bond pad structure and a topmost metal layer according to the second embodiment of the present invention. Note that all the same parts inFIG. 3 as that inFIG. 1 are marked with the same notations and omitted to describe for simplicity.- Referring to
FIGS. 1 and 3 , thebond pad structure 200 of the second embodiment is different from thebond pad structure 100 of the first embodiment that both thenon-bonding portion 116 of thebond pad 106 and the via plugs112 in the first embodiment are located at one side of thebonding portion 114, but thenon-bonding portion 216 of thebond pad 206 and the via plugs212 are respectively located at both sides of thebonding portion 214. Thus, in thetopmost metal layer 210, thecircuit layer 222 is located at both sides of the supportinglayer 220. The supportinglayer 220 and thecircuit layer 222 are, for example, connected to each other. In the other embodiments, the supportinglayer 220 and thecircuit layer 222 can be not connected to each other too. In the embodiment, the via plugs212 located at both sides of thebonding portion 214 are symmetrical about thebonding portion 214. In other embodiments, the via plugs212 located at both sides of thebonding portion 214 can be unsymmetrical about thebonding portion 214. Besides, the parts of thebond pad structure 200 of the second embodiment and the similar parts of thebond pad structure 100 of the first embodiment have almost the same materials and functions, which are omitted to describe herein for simplicity. - Since the
bond pad structure 200 of the second embodiment and thebond pad structure 100 of the first embodiment have the similar technical features; that is, the supportinglayer 220 has at least aslot 224 located between the twobar patterns 226 of the supportinglayer 220, therefore, the fracture of thebond pad 206 or the peeling problem of thebond pad 206 from the dielectric layer during a successive wiring process can be avoided, and moreover, the semiconductor structure under thebond pad 206 can be effectively protected as well. FIG. 4 is a schematic top view of a bond pad structure and a topmost metal layer according to the third embodiment of the present invention. Note that all the same parts inFIG. 4 as that inFIG. 1 are marked with the same notations and omitted to describe for simplicity.- Referring to
FIGS. 1 and 4 , thebond pad structure 300 of the third embodiment and thebond pad structure 100 in the first embodiment that have different connection types of the circuit layer and the supporting layer. In the supportinglayer 120 of thetopmost metal layer 110 of the first embodiment, each of thebar patterns 126 is not connected to each other and connected to thecircuit layer 122 respectively. But, in the supportinglayer 320 of thetopmost metal layer 310 of the third embodiment, each of thebar patterns 326 is connected to each other, and one of thebar patterns 326 and thecircuit layer 322 are connected to each other. In the other embodiments, the supportinglayer 320 and thecircuit layer 322 can be not connected to each other too. An extending direction of thebar patterns 326 and an extending direction of thebonding portion 114 are parallel, for example. In the other embodiments, the extending direction of thebar patterns 326 and the extending direction of thebonding portion 114 could be perpendicular. Besides, the parts of thebond pad structure 300 of the third embodiment and the similar parts of thebond pad structure 100 of the first embodiment have almost the same materials and functions, which are omitted to describe herein for simplicity. - Since the
bond pad structure 300 of the third embodiment and thebond pad structure 100 of the first embodiment have similar technical features; that is, the supportinglayer 320 has at least aslot 324 within the pattern thereof, therefore, the fracture of thebond pad 106 or the peeling problem of thebond pad 106 from the dielectric layer during a successive wiring process can be avoided, and moreover, the semiconductor structure under thebond pad 106 can be effectively protected as well. FIG. 5 is a schematic top view of a bond pad structure and a topmost metal layer according to the fourth embodiment of the present invention. Note that all the same parts inFIG. 5 as that inFIG. 1 are marked with the same notations and omitted to describe for simplicity.- Referring to
FIGS. 1 and 5 , thebond pad structure 400 of the fourth embodiment is different from thebond pad structure 100 of the first embodiment that the pattern of the supportinglayer 120 of thetopmost metal layer 110 in the first embodiment is at least two bar patterns126 (for example, sixparallel bar patterns 126 inFIG. 1 ); but the pattern of the supportinglayer 420 of thetopmost metal layer 410 of the forth embodiment is aspiral pattern 426. The supportinglayer 420 of thetopmost metal layer 410 is, for example, electrically connected to thecircuit layer 422. In the other embodiments, the supportinglayer 420 and thecircuit layer 422 can be not connected to each other too. Besides, the parts of-thebond pad structure 400 in the fourth embodiment and the similar parts of thebond pad structure 100 in the first embodiment have almost the same materials and functions, which are omitted to describe herein for simplicity. - Since the
bond pad structure 400 of the fourth embodiment and thebond pad structure 100 of the first embodiment have the similar technical features; that is, the supportinglayer 420 has at least aslot 424 within the supportinglayer 420, therefore, the fracture of thebond pad 106 or the peeling problem of thebond pad 106 from the dielectric layer during a successive wiring process can be avoided, and moreover, the semiconductor structure under thebond pad 106 can be effectively protected as well. FIG. 6 is a schematic top view of a bond pad structure and a topmost metal layer according to the fifth embodiment of the present invention. Note that all the same parts inFIG. 6 as that inFIG. 1 are marked with the same notations and omitted to describe for simplicity.- Referring to
FIGS. 1 and 6 , thebond pad structure 500 of the fifth embodiment is different from thebond pad structure 100 of the first embodiment that the pattern of the supportinglayer 120 of thetopmost metal layer 110 in the first embodiment is at least two bar patterns126 (for example, sixparallel bar patterns 126 inFIG. 1 ); but the pattern of the supportinglayer 520 of thetopmost metal layer 510 in the fifth embodiment is a grillwork pattern. The supportinglayer 520 of thetopmost metal layer 510 is, for example, electrically connected to thecircuit layer 522. In the other embodiments, the supportinglayer 520 and thecircuit layer 522 can be not connected to each other too. Besides, the parts of thebond pad structure 500 of the fifth embodiment and the similar parts of thebond pad structure 100 of the first embodiment have almost the same materials and functions, which are omitted to describe herein for simplicity. - Since the
bond pad structure 500 of the fifth embodiment and thebond pad structure 100 of the first embodiment have the similar technical features; that is, the supportinglayer 520 has at least aslot 524 within the grillwork pattern of the supportinglayer 520, therefore, the fracture of thebond pad 106 or the peeling problem of thebond pad 106 from the dielectric layer during a successive wiring process can be avoided, and moreover, the semiconductor structure under thebond pad 106 can be effectively protected as well. FIG. 7 is a schematic top view of a bond pad structure and a topmost metal layer according to the sixth embodiment of the present invention. Note that all the same parts inFIG. 7 as that inFIG. 3 are marked with the same notations and omitted to describe for simplicity.- Referring to
FIGS. 3 and 7 , thebond pad structure 600 of the sixth embodiment is different from thebond pad structure 200 of the second embodiment that each of thebar patterns 226 and thecircuit layer 222 located at both sides of thebar patterns 226 are connected to each other in the supportinglayer 220 of thetopmost metal layer 210 of the second embodiment; but each of thebar patterns 626 and thecircuit layer 622 located at at least one side of thebar patterns 626 are connected to each other in the supportinglayer 620 of thetopmost metal layer 610 of the sixth embodiment. In the other embodiments, the supportinglayer 620 and thecircuit layer 622 can be not connected to each other too. Besides, the parts of thebond pad structure 600 of the sixth embodiment and the similar parts of thebond pad structure 200 of the second embodiment have almost the same materials and functions, which are omitted to describe herein for simplicity. - Since the
bond pad structure 600 of the sixth embodiment and thebond pad structure 200 of the second embodiment have the similar technical features; that is, the supportinglayer 620 has at least aslot 624 within the supportinglayer 620, therefore, the fracture of thebond pad 206 or the peeling problem of thebond pad 206 from the dielectric layer during a successive wiring process can be avoided, and moreover, the semiconductor structure under thebond pad 206 can be effectively protected as well. FIG. 8 is a schematic top view of a bond pad structure and a topmost metal layer according to the seventh embodiment of the present invention. Note that all the same parts inFIG. 8 as that inFIG. 1 are marked with the same notations and omitted to describe for simplicity.- Referring to
FIGS. 1 and 8 , thebond pad structure 700 of the seventh embodiment is different from thebond pad structure 100 of the first embodiment that the pattern of the supportinglayer 120 of thetopmost metal layer 110 in the first embodiment is at least two bar patterns126 (for example, sixparallel bar patterns 126 inFIG. 1 ); but the pattern of the supportinglayer 720 of thetopmost metal layer 710 of the seventh embodiment is at least two ring patterns726 (for example, threering patterns 726 inFIG. 5 ), and thering patterns 726 are concentric ring patterns, for example. The supportinglayer 720 of thetopmost metal layer 710 is, for example, not electrically connected to thecircuit layer 722. In the other embodiments, the supportinglayer 720 and thecircuit layer 722 can be connected to each other too. Besides, the parts of thebond pad structure 700 in the seventh embodiment and the similar parts of thebond pad structure 100 in the first embodiment have almost the same materials and functions, which are omitted to describe herein for simplicity. - Since the
bond pad structure 700 of the seventh embodiment and thebond pad structure 100 of the first embodiment have the similar technical features; that is, the supportinglayer 720 has at least aslot 724 within the supportinglayer 720, therefore, the fracture of thebond pad 106 or the peeling problem of thebond pad 106 from the dielectric layer during a successive wiring process can be avoided, and moreover, the semiconductor structure under thebond pad 106 can be effectively protected as well. - In the above-mentioned first to seventh embodiments, the supporting layers are located under the whole bonding portion, for example. However, in the bonding portion, at least a portion of the bonding portion is a region for wiring, and the region is named a bonding region. Therefore, as long as the supporting layer is located under the bonding region, the effectiveness of the invention could be achieved. Thereinafter, an embodiment is provided to illustrate.
FIG. 9 is a cross-sectional diagram of a bond pad structure and a topmost metal layer according to the eighth embodiment of the present invention. Note that all the same parts inFIG. 9 as that inFIG. 2 are marked with the same notations and omitted to describe for simplicity.- Referring to
FIGS. 2 and 9 , thebond pad structure 800 of the eighth embodiment is different from thebond pad structure 100 of the first embodiment that the supportinglayer 120 is located under thewhole bonding portion 114 in the first embodiment; but thebonding portion 114 of the eighth embodiment is divided into abonding region 802 and anon-bonding region 804, and the supportinglayer 820 is only located under thebonding region 802 used for wiring. The pattern of the supportinglayer 820 is anyone of the patterns of the supporting layers in the first to seventh embodiments. Besides, the parts of thebond pad structure 800 in the eighth embodiment and the similar parts of thebond pad structure 100 in the first embodiment have almost the same materials and functions, which are omitted to describe herein for simplicity. - Since the supporting
layer 820 is only located under thebonding region 802, the space under thenon-bonding region 804 could be used to fabricate the customizedrouting 806. - In summary, the above-described embodiments have at least following advantages:
- 1. The bond pad structure provided by the present invention is capable of enhancing the wire pull strength of the bond pad and promoting the reliability thereof.
- 2. The bond pad structure provided by the present invention is able to prevent the bond pad from being fractured or peeled from the dielectric layer during a wiring process.
- 3. The bond pad structure provided by the present invention is able to protect the semiconductor structure under the bond pad during a wiring process.
- It will be apparent to those skilled in the art that various modifications and variations can be made to the structure of the present invention without departing from the scope or spirit of the invention. In view of the foregoing, it is intended that the present invention cover modifications and variations of this invention provided they fall within the scope of the following claims and their equivalents.
Claims (25)
1. A bond pad structure, located over an active circuit structure, comprising:
a bond pad;
a passivation layer, covering the bond pad and having an opening, wherein the opening exposes a part of the bond pad; and
a topmost metal layer in the active circuit structure, wherein a part of the topmost metal layer located under the opening is a supporting layer, wherein the supporting layer has at least a slot, and the topmost metal layer is electrically connected to the bond pad through a plurality of via plugs.
2. The bond pad structure according toclaim 1 , wherein the pattern of the supporting layer is at least two bar patterns.
3. The bond pad structure according toclaim 2 , wherein the bar patterns are parallel to each other.
4. The bond pad structure according toclaim 2 , wherein the bar patterns are connected to each other.
5. The bond pad structure according toclaim 1 , wherein the pattern of the supporting layer is a spiral pattern.
6. The bond pad structure according toclaim 1 , wherein the pattern of the supporting layer comprises a grillwork pattern.
7. The bond pad structure according toclaim 1 , wherein the pattern of the supporting layer is at least two ring patterns.
8. The bond pad structure according toclaim 7 , wherein the at least two ring patterns are concentric ring patterns.
9. A bond pad structure, located over an active circuit structure, comprising:
a bond pad, comprising a bonding portion and a non-bonding portion, wherein at least a portion of the bonding portion is a bonding region;
a passivation layer, covering the bond pad and having an opening, wherein the opening exposes the bonding portion of the bond pad;
a topmost metal layer in the active circuit structure, comprising:
a supporting layer, located under the bonding region of the bond pad and having at least a slot; and
a circuit layer, located under the non-bonding portion of the bond pad, wherein the circuit layer and the supporting layer are connected to each other; and
a plurality of via plugs, electrically connected to the bond pad and the circuit layer.
10. The bond pad structure according toclaim 9 , wherein the pattern of the supporting layer is at least two bar patterns.
11. The bond pad structure according toclaim 10 , wherein the bar patterns are parallel to each other.
12. The bond pad structure according toclaim 10 , wherein the bar patterns are connected to each other.
13. The bond pad structure according toclaim 9 , wherein the pattern of the supporting layer is a spiral pattern.
14. The bond pad structure according toclaim 9 , wherein the pattern of the supporting layer comprises a grillwork pattern.
15. The bond pad structure according toclaim 9 , wherein the pattern of the supporting layer is at least two ring patterns.
16. The bond pad structure according toclaim 15 , wherein the at least two ring patterns are concentric ring patterns.
17. The bond pad structure according toclaim 9 , wherein the supporting layer and the circuit layer are connected to each other.
18. The bond pad structure according toclaim 9 , wherein the supporting layer and the circuit layer are not connected to each other.
19. The bond pad structure according toclaim 9 , wherein the non-bonding portion is located at one side of the bonding portion.
20. The bond pad structure according toclaim 9 , wherein the non-bonding portion is located at both sides of the bonding portion.
21. The bond pad structure according toclaim 20 , wherein the pattern of the supporting layer is at least two bar patterns.
22. The bond pad structure according toclaim 21 , wherein each of the bar patterns and the circuit layer located at at least one side of the bar patterns are connected to each other.
23. The bond pad structure according toclaim 21 , wherein an extending direction of the bar patterns and an extending direction of the bonding portion are parallel or perpendicular.
24. The bond pad structure according toclaim 20 , wherein the via plugs located at both sides of the bonding portion are symmetrical about the bonding portion.
25. The bond pad structure according toclaim 20 , wherein the via plugs located at both sides of the bonding portion are unsymmetrical about the bonding portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/129,333US8115320B2 (en) | 2008-05-29 | 2008-05-29 | Bond pad structure located over active circuit structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US12/129,333US8115320B2 (en) | 2008-05-29 | 2008-05-29 | Bond pad structure located over active circuit structure |
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| US20090294994A1true US20090294994A1 (en) | 2009-12-03 |
| US8115320B2 US8115320B2 (en) | 2012-02-14 |
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| US12/129,333Active2029-11-26US8115320B2 (en) | 2008-05-29 | 2008-05-29 | Bond pad structure located over active circuit structure |
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